diff --git a/library/hkdf.c b/library/hkdf.c
index 0dd4d05..4a8bdfb 100644
--- a/library/hkdf.c
+++ b/library/hkdf.c
@@ -1,7 +1,7 @@
 /*
  *  HKDF implementation -- RFC 5869
  *
- *  Copyright (C) 2016-2018, ARM Limited, All Rights Reserved
+ *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
  *
  *  This file is provided under the Apache License 2.0, or the
@@ -42,8 +42,6 @@
  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  *  **********
- *
- *  This file is part of mbed TLS (https://tls.mbed.org)
  */
 #if !defined(MBEDTLS_CONFIG_FILE)
 #include "mbedtls/config.h"